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tree-ssa-sccvn.c (run_scc_vn): Remove iteration propagating value_ids. 

2012-11-30  Richard Biener  <rguenther@suse.de>

	* tree-ssa-sccvn.c (run_scc_vn): Remove iteration propagating
	value_ids.

From-SVN: r193992
This commit is contained in:
Richard Biener 2012-11-30 10:58:22 +00:00
parent 7dcdcbc0a6
commit bb35348a1b
1 changed files with 11 additions and 19 deletions
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30
gcc/tree-ssa-sccvn.c
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@ -3983,7 +3983,6 @@ run_scc_vn (vn_lookup_kind default_vn_walk_kind_)
{
size_t i;
tree param;
bool changed = true;
default_vn_walk_kind = default_vn_walk_kind_;
@ -4028,25 +4027,18 @@ run_scc_vn (vn_lookup_kind default_vn_walk_kind_)
info->value_id = get_or_alloc_constant_value_id (info->valnum);
}
/* Propagate until they stop changing. */
while (changed)
/* Propagate. */
for (i = 1; i < num_ssa_names; ++i)
{
changed = false;
for (i = 1; i < num_ssa_names; ++i)
{
tree name = ssa_name (i);
vn_ssa_aux_t info;
if (!name)
continue;
info = VN_INFO (name);
if (TREE_CODE (info->valnum) == SSA_NAME
&& info->valnum != name
&& info->value_id != VN_INFO (info->valnum)->value_id)
{
changed = true;
info->value_id = VN_INFO (info->valnum)->value_id;
}
}
tree name = ssa_name (i);
vn_ssa_aux_t info;
if (!name)
continue;
info = VN_INFO (name);
if (TREE_CODE (info->valnum) == SSA_NAME
&& info->valnum != name
&& info->value_id != VN_INFO (info->valnum)->value_id)
info->value_id = VN_INFO (info->valnum)->value_id;
}
set_hashtable_value_ids ();